(19)
(11) EP 1 304 835 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
17.03.2004 Bulletin 2004/12

(43) Date of publication A2:
23.04.2003 Bulletin 2003/17

(21) Application number: 02018545.0

(22) Date of filing: 17.08.2002
(51) International Patent Classification (IPC)7: H04Q 7/38, H04L 12/28
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 17.10.2001 US 329934
25.01.2002 US 56960

(71) Applicant: ALCATEL
75008 Paris (FR)

(72) Inventors:
  • Gurivireddy, Sridhar
    Richardson, Texas 75080 (US)
  • Sarikaya, Behcet
    Plano, Texas 75025 (US)
  • Choyi, Vinod Kumar
    Ottawa, ON K2A 3W5 (US)
  • Xu, Xiaofeng
    Plano, Texas 75023 (US)

(74) Representative: Dreiss, Fuhlendorf, Steimle & Becker 
Patentanwälte, Postfach 10 37 62
70032 Stuttgart
70032 Stuttgart (DE)

   


(54) Network paging system and method


(57) A network paging system (0500) and method implementing a Mobile IP protocol that allows transparent routing of IP datagrams sent by a Correspondent Node (CN) (any Internet node that wants to communicate with a Mobile Node) to a Mobile Node (MN) in the Internet is disclosed. The IP paging protocol disclosed is an extension to Mobile IP to allow dormant mode operation permitting conservation of battery power when not receiving/sending IP datagrams. The disclosed technique permits a mobile node to alternate between dormant and active modes to conserve its power resources. In the disclosed invention, the mobile node does not perform location updates as long as it is in dormant mode. In a preferred embodiment, the implement IP paging protocol is a Layer-3 protocol used to find the paging area, in which the MN is located and to alert MN to come out of dormant mode, whenever there is an incoming traffic. The present invention in some preferred embodiments defines a new paging protocol, which uses triggers from Layer-2 (0560) to gracefully bring down the Layer-3 interface. The disclosed IP paging protocol benefits from a link layer (Layer-2 or L2) triggers, which provide timely information to network layer (Layer-3 or L3) about the progress of events in Layer-2.






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